Fastener for envelops.



\ L PATBNTED JUNE 2, 1903. G- W- ALLEN- FASTBNER PORBNVELOPS.

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finie/@5072- Jmau WM@ UNITED STATES VPatented .T une 2, 1903.

CHARLES W. ALLEN, OF PHILADELPHIA, PENNSYLVANIA.

FASTEN ER FOR ENVELO PS.

SPECIFICATION forming part of Letters Patent No. 729,832, dated June 2, 1903.

Application led November 4, 1902. Serial No.`130,030. A(Model.)

To @ZZ whom it may concern:

Be it known that I, CHARLES W. ALLEN, a citizen of Great Britain, residing at Philadelphia, Pennsylvania, have invented certain new and useful Improvements in Fasteners for Envelops, of which the following is a specif iication.

This invention relates to a fastener for envelops, bags, and similar articles which effectivel y protects theircontentsagainst pilfering and is not apt to become broken or injured during handling or by high temperature.

In the accompanying drawings, Figure lis a front view of an envelop provided with my improved fastener; Fig. 2, a plan of the shell with the string knotted; Fig. 3, a cross-section of Fig. 2; Fig. 4, a plan of the cap; Fig. 5, a perspective view of the same; Fig. 6, a cross section of cap and shell assembled, showing them before beingV compressed; Fig. 7, a plan of the same after being compressed; Fig. 8, a perspective View of a modification of the cap; and Fig. 9 a plan thereof, showing it in connection with the shell My improved fastener is composed, essentially, of two parts, an outer shell and an inner cap which is adapted to fit the shell and to become interlocked therewith'.

The shell a, consists `of a plate of rigid material provided with a-n inwardly-inclined circumferential side Wall a. This side Wall is preferably denticulated, and each tooth may be mutilated by a short transverse incision a2 or otherwise. The body of shell ct is provided With a pair of perforations as for admitting the two ends of a string or equivalent device b, which may be thus interknotted above the shell.

The` cap c is composed of a plain bottom and a corrugated iiaring Wall e', which inclines in the same general direction as the Wall d of shella. The Wall c is expansible under pressure and is to this effect shown to be provided With longitudinal flutes or corrugations, Figs. 4 and 5. When the cap is subjected to pressure, its diameter will increase, because its side wall will then be brought into greater parallelism with the body of the cap. Suitable initials or marks may be stamped upon the cap, as indicated by letters AB.

The relative size of cap and shell is such that the Wall of the former fits Within the Wall of the latter and that the cap is somewhat higher than the shell.

In use the stringb is stitched through the envelop, bag, 85e., and its ends are then brought forward through the holes a3 to be interknotted above the face of shell o. The cap is placed upon the shell to cover the knot, Fig. 6, and pressure is applied by means of a suitableplunger. This pressure acting first upon the protruding portion of the cap will cause a preliminary iattening of the Wall c', which will thus creep underneath wall ct', so as to interlock the cap with the shell. rlhe pressure being continued, both Walls will become iiattened out and the entire fastener will assume the form of a, hollow fiat disk, Within which the knot is securely confined.

It will be seen that my fastener effectively secures the envelop against unauthorized opening. The security is augmented by the teeth of Wall a', which prevent any cutting around the inner edge of the Wall and which expose by their mutilation d2 any attempt to be turned upward.

In Figs. 8 and 9 the wall c of cap c is shown to be made expansible by means of slits oin lieu of the corrugations shown in Figs. 4 and 5.

It is obvious that in lieu of forming the openings in the shell they may beformed in the cap, which would be an equivalent construction.

What I claim isp Y 1. A fastener for envelops composed of a shell having aperforated body and aflaring side wall, an Ainclosed Acap. having a corrugated flaring expansible side Wall that inclines in the same direction as the shell-wall,- and a string that engages the perforated body and is knotted between shell and cap, sub' stantially as specified.

2. In a fastener for envelops, a shell composed of a perforated body and al Haring side Signed by me at Philadelphia, Pennsyi- Wall having mutilated teeth, combined with Vania, this 1st day of November, 1902.

an inoiosed Gap havin@ a arino expansible side Wall that inolinesnin the satxhe direction CHARLES W ALLEN 5 as the shell-Wall, and a string that engages Witnesses: y i

the perforated body and is knotted between ARTHUR BRossMANN, shell and cap, substantially as specified. l C. ToWNsEND ALLEN. 

